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Analog Devices Semiconductor Electronic Components Datasheet

ADP3031 Datasheet

PWM Boost Switching Regulator

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ADP3031 pdf
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PRELIMINARY TECHNICAL DATA
a
2 MHz PWM Boost
Switching Regulator
Preliminary Technical Data
FEATURES
Up to 2 MHz PWM Frequency
Fully Integrated 1.5 A Power Switch
3% Output Regulation Accuracy
Adjustable Output Voltage from 3 V to 12 V
Simple Compensation
Small Inductor and MLC Capacitors
90% Efficiency
Under-voltage Lockout
Shutdown
APPLICATIONS
TFT LCD Bias Supplies
Portable Electronic Instruments
Industrial/Instrumentation Equipment
GENERAL DESCRIPTION
The ADP3031 is a high frequency, step-up DC-DC
switching regulator capable of 12 V boosted output voltage
in a space saving MSOP-8 package. It provides high
efficiency, low-noise operation, and is easy to use. Capable
of operating up to 2 MHz, the high switching frequency and
PWM current mode architecture allow for excellent tran-
sient response, ease of noise filtering, and also small, cost-
saving external inductive and capacitive components. The
current limit and the power switch are integrated completely
on chip.
Capable of operating from 2.5 V to 5.5 V input, the
ADP3031 is ideal for Thin-Film Transistor (TFT) Liquid
Crystal Display (LCD) module applications, where local
point-of-use power regulation is required. Featuring an
adjustable output that supports voltages down to 3 V, the
ADP3031 is ideal to generate today’s low voltage rails,
delivering power efficiently, and simply with minimal
printed circuit board area.
The device is specified over the industrial temperature range
of -40°C to +85°C.
ADP3031
Functional Block Diagram
FB 2
RT 7
REF
COMP
1
ERROR
AMP
gm
IN
6
BIAS
ADP3031
RAMP
GEN
OSC
F/F
RQ
COMPARATOR
S
DRIVER
5 SW
SD 3
8
GND
CURRENT
SENSE
AMPLIFIER
4
PGND
REV. PrB
8/2/02
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel:781/329-4700
World Wide Web Stie: http://www.analog.com
Fax:781/326-8703
©ANALOG DEVICES, INC., 2002


Analog Devices Semiconductor Electronic Components Datasheet

ADP3031 Datasheet

PWM Boost Switching Regulator

No Preview Available !

ADP3031 pdf
PRELIMINARY TECHNICAL DATA
ADP3031–SPECIFICATIONS1
(VIN = +3.3 V, TA = –40°C to 85°C, unless otherwise noted)
Parameter
Symbol
Conditions
Min Typ Max Units
SUPPLY
Input Voltage
Quiescent Current
Switching State3
Non-switching State
Shutdown
ERROR AMPLIFIER
Feedback Voltage
Line Regulation
Bias Current
Overall Regulation
Transconductance
Gain
SWITCH
On Resistance
Output Load Current2
Leakage Current
Efficiency2
Efficiency2
Peak Current Limit
Output Voltage Range
OSCILLATOR
Oscillator Frequency
Maximum Duty Cycle
SHUTDOWN
Shutdown Input Voltage Low
Shutdown Input Voltage High
VIN
IQSW
IQ
ISD
VFB
gm
AV
RON
ILOAD
ICLSET
VOUT
FOSC
DMAX
2.5 5.5 V
f = 600 kHz, light load
2 5 mA
300 500 µA
1 µA
VIN = 2.5 V to 5.5 V
Line, Load, Temp
TBD
–0.1
–3
1.233
100
100
1000
TBD
+0.1
3
V
%/V
nA
%
µA/V
V/V
at ISW=1.5 A, VIN = 3.3 V
200 300 m
continuous operation
200 300
mA
VIN = 3.3 V,VOUT =10 V
VSWITCH = 12 V
5
ILOAD = 200 mA,
85
VOUT = 10 V, f = 600 kHz
ILOAD = 100 mA,
90
VOUT = 10 V, f = 600 kHz
1.5 1.8
µA
%
%
A
3 7 12 V
RT = Open
0.5 0.6 0.7 MHz
RT = GND
1.7 2
2.3 MHz
COMP = open, FB = 1 V
80 85 %
0.8 V
2.2 V
UNDER-VOLTAGE LOCKOUT
UVLO Threshold
UVLO Hysteresis
2.2 2.45 2.5
100
V
mV
NOTES
1 All limits at temperature extremes are guaranteed via correlation and characterization using standard Statistical Quality Control (SQC).
2 See Figure xx.
3 This is the average current while switching.
Specifications subject to change without notice.
–2– REV. PrB


Part Number ADP3031
Description PWM Boost Switching Regulator
Maker Analog Devices
Total Page 8 Pages
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